|Publication number||US7540707 B2|
|Application number||US 11/385,929|
|Publication date||Jun 2, 2009|
|Filing date||Mar 22, 2006|
|Priority date||Mar 23, 2005|
|Also published as||CN1837589A, CN1837590A, CN100472045C, CN100472046C, EP1705340A2, EP1705340A3, EP1705340B1, EP1705342A2, EP1705342A3, EP1705342B1, US7625175, US20060216140, US20060245912|
|Publication number||11385929, 385929, US 7540707 B2, US 7540707B2, US-B2-7540707, US7540707 B2, US7540707B2|
|Inventors||Alexandre Dervaux, Sabine Bermond|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Non-Patent Citations (2), Referenced by (4), Classifications (14), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a link device between an enclosure for passing cooling air, such as a source of cooling air or a plenum enclosure, and a stator nozzle in a turbomachine, such as an airplane turbojet or turboprop.
In a turbomachine, the stator nozzles that are exposed to high temperatures, in particular those downstream from the combustion chamber, include internal cavities for passing a flow of cooling air coming from a radially outer enclosure, part of which air can be diffused into the passage for passing the flow of combustion gas via holes formed in the vanes, and part of it can be exhausted into a radially inner enclosure.
Link means are provided between these enclosures and the stator nozzles to allow cooling air to pass, while minimizing losses and leaks at the interfaces, the link means comprising metal tubes having their ends mounted in leaktight manner in orifices in a casing and in orifices in the stator nozzles.
While the turbomachine is in operation, the casing, and above all the stator nozzles, expand thermally and are subjected to high levels of vibration, thereby generating relative displacements and changes in alignment between the orifices in the casing and those in the nozzles.
To compensate for these relative displacements and changes in alignment, link tubes are used having ends that are enlarged in such a manner as to allow for a small amount of pivoting of the ends of the tubes in the orifices in the casing and in the nozzles, these ends being mounted as tight-fits in the orifices in order to ensure that the assembly is sufficiently leaktight.
Nevertheless, that solution is not satisfactory insofar as mounting the ends of the tubes as tight-fits limits the extent to which they can pivot and leads to zones that present high degrees of wear due to friction against the inside surfaces of the orifices in the casing and in the nozzles, which can lead to leaks at said ends, and even to the link tubes being lost or failing.
According to European patent EP-A2-1 164 250, one solution to this problem consists in associating a ring with each link tube, the ring being mounted between one of the ends of the tube and a nozzle, and carrying an outer collar that can be moved in sliding between a surface of the nozzle and a surface of an annular element fitted on the nozzle and held stationary relative thereto.
Nevertheless, that solution is unsatisfactory since it does not make it possible to compensate relative displacements in rotation between the casing and the nozzle without leading to high degrees of wear in the link tube.
A particular object of the invention is to provide a solution to this problem that is simple, inexpensive, and effective.
To this end, the invention provides a link device between an enclosure for passing cooling air and a stator nozzle in a turbomachine such as an airplane turbojet, the device comprising metal tubes having their ends mounted to slide in leaktight manner in orifices in a casing of the enclosure and in orifices in the stator nozzle, one end of each tube being engaged in a ring having a radially outer collar that is slidable between two guide surfaces that extend perpendicularly to the axis of the orifices and that are carried by said nozzle, wherein the guide surface situated beside the casing is held stationary relative to the nozzle, while the other guide surface is movable axially relative to the nozzle and is associated with return means urging it towards the casing.
The device of the invention makes it possible to absorb offsets and changes in alignment between the orifices in the casing and in the nozzle that result from the turbomachine operating, while nevertheless ensuring continuity of the fluid link between the above-mentioned enclosure and the stator nozzle, and while avoiding wear at the ends of the tubes, and avoiding applying stresses to said tubes.
At each tube, the relative displacements in translation and in rotation between the casing of an enclosure and the nozzle are compensated by the collar of the ring sliding between the guide surfaces of the nozzle and by the return means being compressed resiliently. By way of example, the return means may be a coil spring or a Belleville spring washer.
The tubes therefore do not contribute to compensating the relative displacements between the casing and the nozzle, thereby limiting the extent to which they suffer wear by friction and thus increasing their lifetime.
Advantageously, the end of the tube mounted in the ring includes a surface constituting a segment of a sphere that can pivot and slide in the ring. The other end of the tube may also include a surface constituting a segment of a sphere that can slide and pivot in an orifice in the casing of the enclosure.
Advantageously, the rings of the device of the invention can be associated with prior art tubes having enlarged ends, which is very inexpensive.
The invention also provides a turbomachine such as an airplane turbojet or turboprop, the turbomachine including at least one device as defined above.
The invention can be better understood and other characteristics and advantages of the invention appear on reading the following description made by way of non-limiting example and with reference to the accompanying drawings, in which:
Each vane 20 has an internal cavity 22 for circulating cooling air coming from a feed enclosure 24 located radially outside the wall 16 of the nozzle, part of the air being diffused into the annular passage 18 via slots 26 in the vanes 20, and part being exhausted into an enclosure 28 located radially inside the wall 12 of the nozzle.
The cavities 22 in the vanes are connected to the outer and inner enclosures 24 and 28 by link devices comprising respective metal tubes 30 and 32.
The tubes 30 for passing air from the outer enclosure 24 to the cavities 22 in the vanes have their ends engaged in leaktight manner in bushings 34, 36 secured in orifices formed in the wall 16 of the nozzle, and in orifices formed in a casing 38 of the enclosure 24, respectively.
The tubes 32 for passing air from the cavities 22 in the vanes to the inner enclosure 28 have their ends engaged in leaktight manner in orifices 40, 42 in the wall 12 of the nozzle and in an annular rim of a casing 44 of the enclosure 28, respectively.
When the turbomachine is in operation, the thermal expansion of the stator nozzle 10 and the vibration of the turbine engine lead to relative displacements in translation and in rotation for each tube 30, 32 between the nozzle 10 and the casings of the enclosures 24 and 28.
The outside diameter of the ring 70 is smaller than the inside diameter of the washer 78 and of the orifice in the nozzle, and the outside diameter of the collar 72 is smaller than the inside diameter of a recess 80 in the nozzle that receives the collar 72, thereby enabling the collar 72 to slide between the guide surfaces 74 and 76, and enabling the ring 70 to move in a plane perpendicular to the axis 46.
For each tube, the relative displacements in translation between the casing of the enclosure and the nozzle are compensated by the ends of the tube 30 sliding in the stationary bushing 36 and in the ring 70, and by the collar 72 of the ring sliding between the guide surfaces 74 and 76 of the nozzle.
Nevertheless, relative displacements in rotation between the casing of the enclosure and the nozzle are compensated by the ends of the tubes 30 pivoting in the stationary bushing 36 and in the ring 70, thereby leading to large amounts of wear on the ends of the tube.
The inside diameter of the washer 86 is substantially equal to the inside diameter of the orifice in the nozzle and the inside diameter of the washer 78.
For each tube, the relative displacements between the casing of the enclosure and the nozzle are compensated by the collar 72 of the ring sliding between the guide surfaces 74, 76 of the nozzle, as shown in
In a variant, the rings 70 may be mounted on the ends of the tubes engaged in the stationary bushings 36 of the casing.
The device of the invention may also be mounted between the nozzle 10 and the casing 44 of the inner enclosure 28.
In general, the device of the invention makes its possible to absorb relative displacements between the casing of the enclosure and the stator nozzle without there being any sliding or pivoting of the enlarged or spherical ends 50 of the tubes 30 in the bushings 36 or in the rings 70 so long as these relative displacements remain smaller than the displacement strokes of the collars 72 and/or the compression strokes of the springs 88. This avoids any wear at the ends 50 of the tubes 30, and it is only once the relative displacements between the casing of the enclosure and the nozzle exceed the above-specified displacement strokes of the collars and/or of return spring compression that any pivoting and/or sliding of the ends 50 of the tubes is liable to occur.
The device of the invention is thus capable of absorbing relatively large amounts of displacement between the casing of the enclosure and the nozzle, while providing continuity for the fluid links between the casing and the nozzle, and while minimizing the risks of the link tubes wearing, and minimizing the stresses that are applied thereto.
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|1||U.S. Appl. No. 11/385,659, filed Mar. 22, 2006, Dervaux, et al.|
|2||U.S. Appl. No. 11/385,929, filed Mar. 22, 2006, Dervaux, et al.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8864445 *||Jan 9, 2012||Oct 21, 2014||General Electric Company||Turbine nozzle assembly methods|
|US9518472 *||Jul 18, 2012||Dec 13, 2016||Snecma||Turbine engine stator wheel and a turbine or a compressor including such a stator wheel|
|US20130177447 *||Jan 9, 2012||Jul 11, 2013||General Electric Company||Turbine Nozzle Assembly Methods|
|US20140147264 *||Jul 18, 2012||May 29, 2014||Herakles||Turbine engine stator wheel and a turbine or a compressor including such a stator wheel|
|U.S. Classification||415/135, 415/115|
|Cooperative Classification||F16L41/02, F01D9/065, F01D5/08, F01D11/005, Y02T50/676, F01D9/041|
|European Classification||F01D5/08, F01D9/04B, F01D9/06C, F01D11/00D, F16L41/02|
|Jun 5, 2006||AS||Assignment|
Owner name: SNECMA, FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DERVAUX, ALEXANDRE;BERMOND, SABINE;REEL/FRAME:017962/0802
Effective date: 20060323
|Nov 26, 2012||FPAY||Fee payment|
Year of fee payment: 4
|Nov 29, 2016||FPAY||Fee payment|
Year of fee payment: 8